Valentine's Day -

Thursday February 14, 2019

cards/flowers : Introduced by Pope Gelasus in 498, perhaps in response to a local Roman tradition of lovers writing their names on an urn in February

National Heroes and Benefactors Day -

Monday March 12, 2018

Secular holiday : In tribute to an Englishman, Sir Henry Edward Ernest Victor Bliss, a great benefactor of Belize.

Good Friday -

Friday March 30, 2018

Catholic or protestant : The First Council of Nicaea (a gathering of bishops in the early days of Christianity) wanted to find a day to commemorate the crucifixion and resurrection of Christ.
This commemoration had to be linked to Jewish holiday traditions, since the last supper of Christ was believed to be a Jewish Passover meal. But the Jewish calendar is based on lunar and solar cycles, so the Easter celebration had to follow the same calendar.